Damage to the plasmalemma, chloroplasts and photosystem II after water shortage and high-temperature stress in two lines of maize which differ in endogenous levels of abscisic acid and drought resistance

Conference · Wed May 01 00:00:00 EDT 1991 · Plant Physiology, Supplement; (United States)

OSTI ID:5601074

Ristic, Z; Cass, D D ^[1]

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1. Univ. of Alberta, Edmonton (Canada)

This study examines damage to the plasmalemma, chloroplasts and photosystem II (PS II), and the rate of CO{sub 2} fixation after exposure to 7-d water shortage followed by 6-h (WTS-6) or 24-h (WTS-24) high temperature (45C) stress in the high-level. Abscisic acid (ABA) drought-resistant (DR) line of maize ZPBL 1304 and the low-level ABA drought-sensitive line ZPL 389. Seven-day water shortage followed by 6-h high-temperature stress slightly damaged PS II in the DR line ZPBL 1304. The DS line ZPL 389 was affected by WTS-6 to a great extent; however, the stress-caused damage to this line was reversible. Exposure to WTS-24 caused reversible damage to the plasmalemma, chloroplasts and PS II in DR line. The DS line was not capable of withstanding severe stress conditions; WTS-24 killed almost all the plants. The results on the rate of CO{sub 2} fixation were in agreement with those on the damage to the plasmalemma, chloroplasts and PS II. Considerable drought and heat resistance was apparent in the line (ZPBL 1304) which synthesizes a unique band of heat-shock protein(s) of 45 KDa. In conclusion, the high-level ABA DR line ZPBL 1304 showed much greater capability of withstanding WTS than the low-level ABA DS line ZPL 389.

• OSTI ID: 5601074
• Report Number(s): CONF-9107184-; CODEN: PPYSA
• Journal Information: Plant Physiology, Supplement; (United States), Vol. 96:1; Conference: Annual meeting of the American Society of Plant Physiology, Albuquerque, NM (United States), 28 Jul - 1 Aug 1991; ISSN 0079-2241
• Country of Publication: United States
• Language: English

Related Subjects

59 BASIC BIOLOGICAL SCIENCES
DROUGHTS
ENVIRONMENTAL EFFECTS
MAIZE
BIOLOGICAL STRESS
INJURIES
ABSCISIC ACID
CARBON DIOXIDE FIXATION
CELL CONSTITUENTS
COMPARATIVE EVALUATIONS
PHOTOSYNTHETIC REACTION CENTERS
PHYSIOLOGY
PROTEINS
TOLERANCE
AUXINS
CARBOXYLIC ACIDS
CEREALS
EVALUATION
GRAMINEAE
LILIOPSIDA
MAGNOLIOPHYTA
MONOCARBOXYLIC ACIDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
PLANT GROWTH REGULATORS
PLANTS
551000* - Physiological Systems